My bad, the model name is KM5A. Still cannot find any guide on the web... Bo
On Sun, May 17, 2020 at 8:18 PM General Gao <general.z....@gmail.com> wrote: > Hi, I am coming back to the issue here. Tried to clean the paddle, the > paddle looked pretty straight forward and rotates freely. The back of my > speedometer has a name called "SR Instruments", no model name, which > surprised me. > > Is there a way to diagnose the electronics? Just wanted to give it a try > before biting the bullet. > > Thank you in advance. > > Bo > > > On Mon, Apr 13, 2020 at 8:58 AM Della Barba, Joe via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Pitot tube knotmeters are found on fast powerboats and airplanes. They >> don’t really work much below 10 knots and in both cases the tubes can get >> plugged with bugs or seaweed. >> >> It took me literally years to find spares for my ancient S-H knotmeter >> that has been out of production since the 1980s. The paddle wheel gets >> clogged so easily I never leave it in anymore if not using it. >> >> >> >> *Joe Della Barba Coquina C&C 35 MK I* >> >> *www.dellabarba.com <http://www.dellabarba.com>* >> >> >> >> >> >> >> >> *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *John >> and Maryann Read via CnC-List >> *Sent:* Monday, April 13, 2020 7:49 AM >> *To:* cnc-list@cnc-list.com >> *Cc:* John and Maryann Read <johnprea...@gmail.com> >> *Subject:* [EXTERNAL] Re: Stus-List speedometer - C&C 35 Mk2 >> >> >> >> Have had similar issues with my prior unit – Standard Horizon model 150 >> which went out of production some 15 years ago and parts are hard to come >> by and only on flea bay. >> >> What brand and model is your speedometer? >> >> No – no tubes per se. Yours is all electric. The paddle wheel has a >> small magnet in one of the blades. As it rotates, the electric pulse is >> picked up by the transducer creating an electrical pulse which is >> transmitted via the wire to your bulkhead gauge. The faster the wheel >> turns the pulse increases and your gauge registers greater speed. >> >> >> >> Vast majority of issues are caused by growth around the blades, the blade >> shaft or water facing of the transducer. Ensure this is absolutely clean >> and blades turn freely. Normally requires cleaning several times each >> season. If this is good, then your transducer may be worn out / faulty. >> Virtually all are made by Airmar and their web site has an excellent cross >> reference of your unit to their current part number. This will require re >> running the wire to your gauge which is often PITA and involves boat yoga. >> In my case this fixed the problem. >> >> >> >> When I had problem with other units of my instruments and parts were >> nowhere to be found, Santa was very nice and provided a new suite with all >> the latest whiz bang features >> >> >> >> Best of luck >> >> >> >> John and Maryann >> >> Legacy III >> >> 1982 C&C 34 >> >> Noank, CT >> >> >> >> >> >> >> >> >> >> *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com >> <cnc-list-boun...@cnc-list.com>] *On Behalf Of *General Gao via CnC-List >> *Sent:* Sunday, April 12, 2020 9:18 PM >> *To:* cnc-list@cnc-list.com >> *Cc:* General Gao >> *Subject:* Stus-List speedometer - C&C 35 Mk2 >> >> >> >> My speedometer was not behaving well last season. I am planning to fix it >> myself. Googled the keyword, it came up a few documents suggesting blowing >> the tube to clear clog. I looked at my gauge and where there sensor is, I >> don't seem to find a tube there. Please see the pictures attached in the >> link. Could someone help me with the diagnostics? Thank you in advance. >> >> >> >> https://drive.google.com/open?id=1nYSpxnzb1BImby5jz3ASLnSD3OYxKT3P >> <https://protect2.fireeye.com/v1/url?k=837e7d76-dfe835d6-837e5401-0cc47adca788-b178bd7dca34f18d&q=1&e=756d065d-3ce3-4c05-a863-e82db01be882&u=https%3A%2F%2Fdrive.google.com%2Fopen%3Fid%3D1nYSpxnzb1BImby5jz3ASLnSD3OYxKT3P> >> >> >> >> https://drive.google.com/open?id=1bBgw-Ln_wr2Qae-GUCk3L_I_dAQO-ekY >> <https://protect2.fireeye.com/v1/url?k=8f8e2f51-d31867f1-8f8e0626-0cc47adca788-77686a1316f3f8b1&q=1&e=756d065d-3ce3-4c05-a863-e82db01be882&u=https%3A%2F%2Fdrive.google.com%2Fopen%3Fid%3D1bBgw-Ln_wr2Qae-GUCk3L_I_dAQO-ekY> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >>
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